The C30 running gear is only around 100lb heavier than B series.....What we have stripped out in weight as part of the build we have probably put most back in in terms of rear subframe, heavier hubs, extra weight of plumbing and fluid on board and so on. I would probably guess it won't be too far off factory - maybe 50-100lb heavier and with the support mods should be making roughly twice the power of a stock GSR, so all in all I think/hope it'll be worth the effort!